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TIL the average lifespan of a major league baseball is only seven pitches

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epkp4 TIL about the cosmic lithium problem: Post-Big Bang, the universe had mainly hydrogen and helium, with traces of lithium and beryllium. Surprising, there's 3x less lithium in ancient stars than predicted and scientists aren’t sure why.
rY4W TIL researchers printed out a beating mouse heart using a modified printer with cells in the ink cartridge.
Brp8L TIL the city blackbirds have shorter beaks; don’t migrate anymore; have different stress responses; start breeding much earlier in the year; and sing at a different pitch. This has evolved them into a new species.
LkKrp TIL that organs are not only older than pianos, but have existed as early as ancient Greece and required multiple people to play them.
neond TIL Based on da Vinci's work, there is evidence that the artist had strabismus: one eye is straight, while the other eye can drift. Some forms of strabismus are thought to facilitate artistic work by suppressing the deviating eye, which creates 2D monocular vision advantageous to painting & drawing